Alumina (for ceramics)

Alumina hollow spheres are a new type of high-temperature insulation material. They are made by melting and blowing industrial alumina in an electric furnace. The crystal form is α-Al2O3 microcrystals. Using alumina hollow spheres as the main body, various specifications of refractory lightweight products can be made. The maximum operating temperature is 1800℃, with high mechanical strength, low thermal conductivity, and stable performance under various atmospheres. They are widely used in high-temperature and ultra-high-temperature kilns such as gasification furnaces in the petrochemical industry, reaction furnaces in the carbon black industry, and induction furnaces in the metallurgical industry, achieving very satisfactory energy-saving effects.

Alumina hollow spheres and their products are a kind of lightweight refractory material with excellent high-temperature resistance and energy saving. Alumina hollow spheres can be used as high-temperature and ultra-high-temperature insulation fillers, lightweight aggregates for high-temperature refractory concrete, and high-temperature castables. Alumina hollow sphere bricks can be used in high-temperature energy-saving (>30%) inverted flame kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, nitriding furnaces, etc. They can significantly reduce kiln weight, improve structure, save materials, and conserve energy.